Checks
| Action
|
DEFINITION: The engine delivers less than expected power. There is little or no increase in speed when partially applying the accelerator pedal.
|
Preliminary Checks
|
| • | Compare the vehicle with a similar unit. Ensure the vehicle has an actual problem. |
| • | Compare the scan tool data at idle with the scan tool data list. Refer to
Scan Tool Data List
. |
| • | Remove the air filter and check for dirt, or for air ducts being plugged or leaking. Repair or replace as necessary. |
| • | Inspect for a proper transmission operation. |
| • | Inspect the engine oil level and quality. |
|
Sensor Inspection
|
| • | Observe the fuel rail pressure (FRP) sensor and the fuel pressure regulator commanded percent at idle. FRP should be near 40 MPa, and commanded percent should be near 40 percent. If the command is high, a fuel pressure or sensor exists. |
| • | Inspect the crankshaft position (CKP) sensor reluctor wheel. Remove the CKP sensor and attempt to move the reluctor wheel front to back or side to side with a probe. If there is any movement the reluctor wheel retaining bolts are loose. |
|
Fuel System Checks
|
| • | Observe the actual vs desired fuel rail pressure with a scan tool, with the engine idling. |
| • | Inspect the engine speed signal circuit for high resistance. |
|
Exhaust System Checks
| Inspect the exhaust system for a possible restriction. Refer to
Restricted Exhaust
in Engine Exhaust.
|
Air Intake System Checks
|
| • | Inspect for an air leak or restriction in the air inlet ducts or the intake manifold. Refer to
DTC P0234
. |
| • | Inspect for an air leak in the charge air cooler with a
J 46091
Charge Air Cooler Tester. |
| • | Inspect for a restriction in the charge air cooler. |
| • | Inspect for a worn or damaged turbo charger turbine wheel, shaft or compressor wheel. |
| • | Inspect for a skewed mass air flow (MAF) sensor. Refer to Diagnostic Aids in
DTC P0101
. |
|
Engine Mechanical Check
| Inspect the engine for the following:
| • | Improper or worn camshaft |
Refer to
Engine Compression Test
in Engine Mechanical.
|
Additional Checks
|
| • | Inspect the control module grounds for being clean, tight, and in their proper location. |
| • | Inspect the torque converter clutch (TCC) operation. |
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